Ubuntu Security Notice 888-1 - It was discovered that Bind would incorrectly cache bogus NXDOMAIN responses. When DNSSEC validation is in use, a remote attacker could exploit this to cause a denial of service, and possibly poison DNS caches. USN-865-1 provided updated Bind packages to fix a security vulnerability. The upstream security patch to fix CVE-2009-4022 was incomplete and CVE-2010-0290 was assigned to the issue. This update corrects the problem. Michael Sinatra discovered that Bind did not correctly validate certain records added to its cache. When DNSSEC validation is in use, a remote attacker could exploit this to spoof DNS entries and poison DNS caches. Among other things, this could lead to misdirected email and web traffic.
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